Combination socket and resistance



A. H. DONAHUE.

COMBlNATlON SOCKET AND RESISTANCE. APPLlcArloN FILED FMR. 1, 1921.

1,416,948. Patented May23,1922.

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-UNITED STATES- PATE NioFFlcE.:

ALFRED H. DONAHOE, F CHICAGO, ILLINOIS, ASSIGNOIR TO ASSOCIATED ENGINEERS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF`ILLINOIS'.

i COMBINATION.. SOCKET AND RESISTANCE Application led March 7,

To all whom t may concern.'

- Be it known that I, ALFRED H.l DoNAHoE, a citizen of the United States," residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Combination Sockets and Resistances, of which the following is a full, clear, concise, and exact description,

reference being had to thek accompanying drawings, forming a part of this specification. f

This invention relates to combination sockets and lresistances, and more particularly'to a lamp socket and a resistance associated as a unit.

It is a purpose of the invention to provide a combined ,socket and resistance of the above mentioned characterthat is particularly adapted for use on a switch board panel provided with signal lights, wherein the sockets carrying such lights are frequently arranged in close proximity and where it is desirable that the sockets and the vresistances associated therewith occupy a mlnimum of space on said panel. y

It-is a further purpose of the invention to provide a device of the above mentioned character wherein the central contact member of the socket is adapted to support the resistance associated therewith, the socket projecting through said switch board pane] and said resistance projecting rearwardly from said socket and said panel.

It is another object of the invention to provide a socket having a central contact comprising an elongated pin or rod-like memberl projecting rearwardly therefrom, upon which a tubular resistance element is adapted to bemnounted and to provide suitablemeans for securing said'resistance element thereon and holding thel same in spaced relation to the support, said means comprising spacing washers provided with lugs. struck outwardly therefrom and adapted to engage said tubular resistance element to hold the same in co-axially spaced relation to said supporting pin or rod.

It is still another purpose of the invention to provide means for readily securing the unit comprising the resistance and socket in position in the switch board panel said means comprising a spring seated in a groove in the socket portion of .said device `Specification of fetters Patent. Patented lVIay Z, 19.22.

1921. Serial No. 450,437.

onal and of such normal shape that the angles of the polygon will pro'ect outwardly beyond the groove, so as to firmly grip the adjacent wall of the opening in the panel when in position therein. Other objects and advantages o f the invention will appear as the description of the accompanying drawings showing one yform that my invention may take proceeds. However, I desire to`have it distinctly understood that I do not intend to limit myself to the eXtact details shown and described, but that I intend to include as'part of my invention all such obvious changes and modifications of parts as would occur toa person skilled in this art'and as would fall within'the scope of the claims.

UIn the drawings Fig. 1 is a fragmentary transverse section of a switch panel board, showing the improved socket and resistance associated therewith in longitudinal section;

Fig. 2 is a section thereof taken on line 2-2, Fig. 1;

Fig.- 3 is aside elevation of said socket and resistance;

Fig. 4 is a plan view of the centering washer for the resistance, and

Fig. 5 is a transverse section thereof.

Referring in detail to the drawings a fragmentary cross section of a switch board panel is shown in Fig. 1 and in Fig. 2, the same being designated by the numeral 10. The panel is usually made of a slab of material, such as slate or marble, and is provided with a plurality of openings 11 adapted to receive the improved socket and resistance embodied in the present invention. The socket comprises an outer caslng of -fibre or other insulating material 12 provided with a circular peripheral groove 13 within which is seated a spring wire 14. The sprin wire 14 is bent into polygonal shape pre erably octagonal as shown in Fig. 2 and is open at the ends thereof. The wire 14 is bent so that the figure which it forms will have a larger diameterthan the outer diameter of the substantially cylindrical portion 15 of the member 12, so that the angles of the Wire will be adapted to engage with the inner surface of the opening 11, so

as to frictionally hold the member 12 inl place in the opening. ,The outer casing 12 a rib at 16 to act as an abutment to limit the movement of the casing 12 inwardly and to provide a suitable flange or shoulder for engagement with the outer face of the panel 10. The casi-ng' 12 preferably has a forward lextension 17 that is adapted to partially surround the bulb 18, and is preferably provided with an opening curved to conform to the shape of the bulb at 19. The casing 12 may be screwthreaded as at 37, rearwardly from the groove 13, so that a nut may be i screwed thereonto secure the socketin place `on switchboard panels that are so thin that i socket is also provided with a central contact formed by the end portion 2li of the screwthreaded rod or' pin 25, and is provided with a lining of mica or other insulating material at 26. rlThe rod 25 is provided with bevelled head 25 having a transverse slot provided therein for receiving a screw driver, held assembled with the socket by means of the nut 27, which is screwed up on the rod until it engages with )the inner end of the member 12.-

rlllhe rod 25 extends rearwardly a consid erabie distance trom the socket and is provided with a pair of nuts 28 and 29 and a pair of washers 30 and 31 mounted thereon, and between the washers 30 and 31 is mounted the resistance element 32 provided with any desired form of winding 33, the resistance element being in the 'form of a tube, as will be seen from? Figs. 1 and 3. rllhe tubular resistance element is of a larger internal diameter than the outer diameter of the rod 25, and it is accordingly necessary to provide means for centering the resistance element on the rod, as the mere clamping of the same between the washers by means of the nuts 28 and 29 will not hold the tubular member properly on the rod. A lock nut 28 is provided for the nut 28.

ln order to hold the same centered the washers are providedwith out struck lugs that/are adapted to engage the inner surface of the tubular element and hold the same centered on the rod. ln Figs. 4 and 5 is shown one of the washers 30 provided with the out struck projecting portions 30 which are adapted to engage withthe tubular element 32 as described above. The

.other terminal wire of the circuit 34 is connected to the central rod or pin 25 by means of the nut 35, which clamps the wire 34 between itself and the nut 29. It will thus be seen that the resistance and the lamp are connected in series by the arrangement described above and that a very compact and efficient device of this character for switch board use is obtained. The circuit through the device is as follows:

lFrom the one terminal of the circuit in which the combined resistance and socket is connected, the wire 34 leads to the central pin or rod 25 to the central contact of the socket 24 through the lamp 18 to the wire 23 through the resistance 33 and to the other terminal wire of the circuit36. it will be seen that the members 20 and 20 are provided with enlarged openings for receiving the rod or pin 25 so that the same are spaced therefrom and out of electrical contact therewith.

Having thus described my invention "what l claim and desire to secure by U. S. Letters Patent is:

1. lin a device of the character described a lamp socket, a rod-like member having one end thereof secured within said socket and forming the central contact thereof, and a resistance element mounted on and surrounding said rod-like member rearwardly of said socket.

2. ln a device of the character described a lamp socket, a rod-like member having one end thereof secured within saidsocket and forming the central contact thereof, a resistance element mounted on and surrounding said rod-like member and means for holding said resistance element in alignment with said socket.

ln a device of the character described a lamp socket, a rod-like member having one end thereof secured within said socket and forming the central contact thereof, a tubular resistance element mounted on and surrounding said rod-like member and means for centering said resistance element thereon.

di. in a device of the character described a lamp socket, a rod-like member extending rearwardly therefrom, a tubular resistance element mounted on and surrounding said rod-like member and means on said rod-like member for centering said resistance element thereon.

5. ln a device of the character described a lamp socket, a rod-like member extending rearwardly therefrom, a tubular resistance element` mounted on said rod-like member,

`means on said rod-like member for centering said resistance element thereon, and means for holding 'said` resistance element from longitudinal movement on said rod-like member.

6. In a device of the character described a lamp socket, a rod-like member extending rearwardly therefrom, a tubular resistance element mounted on said rod-like` member, means on said rod-like member for centering said resistance element thereon, and'means for holding said resistance element from longitudinal movement o-n said rod-like member.

7. The combination with a lamp socket having a. circular groove therein, of a polygonal spring wire member seated in said groove, said wire member being adapted to engage the Wall of an opening 1n a member in which said socket is mounted tofrictionally hold said socket therein.

8. In a device of the character described, a supporting member provided with an opening therethrough, of a lamp socket mounted in said opening, a screw threaded rod-like member projecting rearwardly from said socket and said supporting member and having one end thereof secured within said socket and forming the central contact thereof, and a tubular resistance element mounted on said rod-like member rearwardly of said support.

9. In a device of the character described, a supporting member provided with an opening therethrough, of a lamp socket mounted in said opening, a screw threaded rod-like member projecting rearwardly from said socket and said supporting member and having one end thereof secured Within said socket and forming the central Contact thereof, a tubular resistance element mounted on said rod-like member rearwardly of said support, nuts on said rod for adjustably securing said resistance element in position on said rod and washers between said nuts and said resistance element.

10. In a device of the character described, a supporting memberprovided with an opening.therethrough, of a lamp Socket mounted in Said opening, a screw-threaded rod-like member p-rojecting rearwardly from said socket and said supporting member' and having one end thereof secured within said socket and forming the cent-ral cont-act thereof, a tubular resistance element mounted on said rod-likemember rearwardly of said support, nuts on said rod 4for adjustably securing said resistance element in position on said rod and Washers between said nuts and said resistance element, said washthereof, a. tubular resistance element mounted on said rod-like' member rearwardly of said support, nuts on said rod for adjust' ably securing said resistance element in position on said rod and'washers between said nuts and said resistance element, said socket member being provided with a peripheral groove and a polygonal spring member seated in said groove and adapted to hold' said socket in position in said openng.

12. In a device of the character described, a supporting member provided with an opening therethrough, of a lamp socket mounted in said opening, a screw threaded rod-like member projecting rearwardly from said socket andsaid supporting member and having one end thereof secured within said socket and forming the central contact thereof, a tubularl resistance element mounted on said rod-like member rearwardly of said support, nuts on said rod for adj ustably securing said Aresistance element in position onsaid rod and washers between said nuts and said resistance element, said socket member being provided with a portion having a curved seat within which a bulb is adapted toI rest to protect said bulb.

13. In a device ofthe character described a lampl socket, a rod-like member having one end thereof secured within said socket and forming the central contact thereof, and a resist-ance element mounted on said rod-like member rearwardly of said socket, said Socket being provided with an externally screw-threaded portion adapted to have a nut threaded thereon to secure said socket in place on a switch-board panel.

In witness whereof, I hereunto subscribe my name this 28rd day of February A. D., 1921.

' ALFRED H. DONAHOE. 

